that's like cannabis cannibalism!!! personally i think it's ok to smoke around your plants. just don't hotbox the room, keep it well ventilated to ensure you don't choke the plant, or clog up its micro breathing holes on the leaves...(stomata?)
well think tou urself the medical harm it does to u, cant be good for em
tabacco smoking is a huge no-no around em, so if ur joints r spun then dont, but otherwise keep iit to a minimum